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首页> 外文期刊>The Journal of Prosthetic Dentistry >Comparison of 3D displacements of screw-retained zirconia implant crowns into implants with different internal connections with respect to screw tightening
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Comparison of 3D displacements of screw-retained zirconia implant crowns into implants with different internal connections with respect to screw tightening

机译：将螺旋保留氧化锆植入冠的3D位移与不同内部连接的植入物相对于螺钉拧紧的比较

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Abstract Statement of problem Internal conical implant-abutment connections without horizontal platforms may lead to crown displacement during screw tightening and torque application. This displacement may affect the proximal contacts and occlusion of the definitive prosthesis. Purpose The purpose of this in?vitro study was to evaluate the displacement of custom screw-retained zirconia single crowns into a recently introduced internal conical seal implant-abutment connection in 3D during hand and torque driver screw tightening. Material and methods Stereolithic acrylic resin models were printed using computed tomography data from a patient missing the maxillary right central incisor. Two different internal connection implant systems (both ～11.5 mm) were placed in the edentulous site in each model using a surgical guide. Five screw-retained single zirconia computer-aided design and computer-aided manufacturing (CAD-CAM) crowns were fabricated for each system. A pair of high-resolution digital cameras was used to record the relationship of the crown to the model. The crowns were tightened according to the manufacturers’ specifications using a torque driver, and the cameras recorded their relative position again. Three-dimensional image correlation was used to measure and compare crown positions, first hand tightened and then torque driven. The displacement test was repeated 3 times for each crown. Commercial image correlation software was used to extract the data and compare the amount of displacement vertically, mesiodistally, and buccolingually. Repeated-measures ANOVA calculated the relative displacements for all 5 specimens for each implant for both crown screw hand tightening and after applied torque. A Student t test with Bonferroni correction was used for pairwise comparison of interest to determine statistical differences between the 2 implants (α=.05). Results The mean vertical displacements were statistically higher than the mean displacements in the mesiodistal and buccolingual directions for both implants ( P P P >.05). Conclusions Within the limitations of this in?vitro study, screw-retained zirconia crowns tended to displace in all 3 directions, with the highest mean displacement in the vertical direction at iteration 1. However, the amount of displacement of crowns between the 2 different implants was statistically insignificant for all directions and iterations.
机译：无水平平台的内圆锥种植体基牙连接在螺钉拧紧和扭矩应用过程中可能会导致牙冠移位。这种移位可能会影响最终假体的近端接触和咬合。目的这件事的目的是什么？体外研究旨在评估手动和扭矩螺丝钉拧紧过程中，定制螺钉固定的氧化锆单冠在三维空间内移位到最近推出的内锥密封种植体基牙连接中。材料和方法利用一名上颌骨右中切牙缺失患者的计算机断层扫描数据打印立体石丙烯酸树脂模型。在每个模型中，使用手术引导将两种不同的内连接种植系统（均为11.5 mm）放置在无牙区。为每个系统制作了五个螺钉固定的单氧化锆计算机辅助设计和计算机辅助制造（CAD-CAM）牙冠。一对高分辨率数码相机被用来记录皇冠与模型的关系。使用扭矩驱动器按照制造商的规格拧紧牙冠，摄像头再次记录它们的相对位置。三维图像相关用于测量和比较牙冠位置，先用手拧紧，然后用扭矩驱动。每个牙冠重复3次位移测试。使用商业图像相关软件提取数据，并比较垂直、近垂直和颊舌位移量。重复测量ANOVA计算了每个种植体的所有5个样本在手动拧紧牙冠螺钉和施加扭矩后的相对位移。采用带Bonferroni校正的Student t检验进行兴趣配对比较，以确定两种植入物之间的统计差异（α=0.05）。结果两种种植体的平均垂直位移均高于近中、颊舌方向的平均位移（P>0.05）。结论是否在本文的限制范围内？体外研究表明，螺钉固位氧化锆冠在所有3个方向上都有位移趋势，在第1次迭代时，垂直方向上的平均位移最高。然而，在所有方向和迭代中，两种不同种植体之间的牙冠位移量在统计学上均不显著。

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    Hanadi A. Rebeeah; Burak Yilmaz; Jeremy D. Seidt; Edwin McGlumphy; Nancy Clelland; William Brantley;

  • 作者单位

    Division of Prosthetic Dentistry Hamad Medical Corporation;

    Division of Restorative and Prosthetic Dentistry The Ohio State University College of Dentistry;

    Department of Mechanical and Aerospace Engineering The Ohio State University College of Engineering;

    Division of Restorative and Prosthetic Dentistry The Ohio State University College of Dentistry;

    Division of Restorative and Prosthetic Dentistry The Ohio State University College of Dentistry;

    Professor and Director of Graduate Program in Dental Materials Science Interim Chair of Division;

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  • 正文语种 eng
  • 中图分类 口腔科学;
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